Hectograph mass containing color intensifiers



Patented Oct. 1, 1940 HECTOGRAPH MASS CONTAINING COLOR INTENSIFIERS William Hoskins, Jr., La Grange, 111., assignor to Ditto, Incorporated, Chicago, 111., a.corporation of West Virginia No Drawing. ApplicationJanuary 14, 1939, Serial No. 250,970

20 Claims.

The invention relates to the art of duplicating. More particularly, it relates to hectograph duplicating devices, hectograph duplicating compositions and to the reproduction of color designs from such duplicating devices and compositions.

- An object of the invention is to provide an efficient and inexpensive hectograph mass for duplicating purposes.

Another object is to provide a duplicating mass from which copies of high color intensity may be prepared.

One form of the invention is a gelatinous duplicating mass of the hectograph type containing a salt of a fatty acid.

The gelatinous duplicating mass may suitably comprise a gel forming substance such as glue or gelatin; water,'and' a water soluble salt of a carboxylic acid of the aliphatic series, compatible with glue or gelatin, such as sodium acetate, sodium butyrate, potassium acetate, ammonium formate, and the like. Preferably, however, it will also contain a water soluble substantially non-volatile hygroscopic extending agent, such as glycerine, ethylene glycol, malt syrup, invert sugar, and the like.

The proportion of binder (glue or gelatin) to other materials may vary widely. Preferably, however, the ratio of water and water soluble materials (including extending agents and color in- 0 tensifiers) to binder should be within five to twenty times the weight of the binder. This ratio will give a commercially suitable hectograph blanket capable of receiving and retaining impressions having improved color intensity, and adapted for hard usage such as on a hectograph band in any of the numerous hectograph machines on the market.

By way of illustration, several suitable formulae for hectograph blankets are given in the following table:

Other suitable formulae are given in the m1- lowing table.

Example Ingredients Glycetine Ammonium propionate It will .be understood that the above gelatinous compositions may be adhered to a flexible backing to form a duplicating roll constituting another embodiment of this invention. Duplicating pads may likewise be made.

Copies of color designs may be made from the compositions of this invention by carrying out on the duplicating mass.

The invention makes it possible to produce a large number of color designs" of high'color intensity. As far as is known, the copies are much brighter than have hitherto been made by the use of prior art gelatinous duplicating masses of similar desirable mechanical and weather resisting properties.

While there have been shown and described certain forms of this invention, it is to be understood that it is capable of many modifications.

Changes, therefore, in the construction and arrangement may be made without departing from the spirit and scope of the invention as described in the appended claims, in which it is the intention to claim all novelty inherent in the invention as broadly as possible, in view of the prior art.

In the claims the term gelatin is intended to include ordinary glue, sometimes called impure gelatin, but which more strictly is a decomposition product resulting from the breakdown of gelatin molecules into molecules of less molecular weight.

This application is a continuation-in-part of my co-pending application Serial No. 187,911 filed January 31, 1938.

In addition to the various salts of fatty acids disclosed in the instant application, other water soluble salts of organic acids which are compatible with glue or gelatin may be used in the practice of this invention, including the water soluble salts of hydroxy acids disclosed and claimed in my co-pending application Serial No. 187,911. Examples of such salts are sodium lactate, sodium oxybutyrate, sodium citrate, and ammonium lactate. In many ways, however, a hectograph composition containing a salt of a fatty acid is a specific improvement on a hectograph composition containing a salt of a hydroxy acid, although generically the inventions are the same and are both based on the discovery that such salts can Wholly or partially replace glycerine and the like in hectograph compositions without detrimentally afiecting the mechanical and weatherin qualities while increasing the color intensity of copies obtained from the compositions by the hectograph process.

I claim:

1. A duplicating pad or roll comprising a backing having secured thereto a mass adapted for use in a hectograph process, said mass having incorporated therein a color intensifier comprising a salt of an organic acid selected from the group consisting of alkali metal and ammonium salts.

2. A duplicating pad or roll comprising a backing having secured thereto a gelatinous mass adapted for use in a hectograph process, said mass having incorporated therein a color intensifier comprising a water soluble salt of a carboxylic acid selected from the group consisting of alkali metal and ammonium salts.

3. A duplicating pad or roll comprising a backing having secured thereto a mass adapted to receive and retain impressions of a water and alcohol soluble dye, said mass having incorporated therein a water soluble salt of a fatty acid selected from the group consisting of alkali metal and ammonium salts.

4. A duplicating pad or roll comprising a backing having secured thereto a gelatinous. mass adapted for use in a hectograph process, said mass comprising gelatin, water, a polyhydroxy alcohol and a water soluble salt of a fatty acid selected from the group consisting of alkali metal and ammonium salts.

5. A duplicating pad or roll comprising a backing having secured thereto a gelatinous mass adapted for use in a hectograph process, said mass comprising gelatin, water, a polyhydroxy alcohol and sodium acetate.

6. A duplicating pad or roll comprising'a backing having secured thereto a gelatinous mass adapted for use in a hectograph process, said mass comprising gelatin, water, a polyhydroxy alcohol and potassium formate.

7. A duplicating pad pr roll comprising a backing having secured thereto a gelatinous mass adapted for use in a hectograph process, said ma'ss comprising gelatin, water, a polyhydroxy alcohol and ammonium propionate.

8. The process of reproducing color designs in a duplicating process to form color designs having increased color intensity which comprises contacting a design formed of a soluble dye on a master copy with a gelatinous duplicating mass containing a salt of a carboxylic acid selected from the group consisting of alkali metal and ammonium salts, removing said master copy whereupon a design in reverse is left on the gelatinous mass, and applying a copy sheet to said mass to transfer the design to said copy sheet.

9. In the process of reproducing color designs by duplicating processes, the step of contacting a copy sheet with a design on a gelatinous duplicating mass containing a salt of a short chain carboxylic acid of the aliphatic series selected from the group consisting of alkali metal and ammonium salts.

10. In the process of reproducing color designs by a duplicating process, the step of contacting a copy sheet with adesign on a gelatinous duplicating mass having incorporated therein a salt of a fatty acid selected from the group consisting of alkali metal and ammonium salts.

11. In the process of reproducing color designs by a duplicating process, the step of contacting a copy sheet with a design on a gelatinous duplicating mass having incorporated therein sodium acetate.

12. In the process of reproducing color designs by a duplicating process, the step of contacting a copy sheet with a design on a gelatinous duplicating mass having incorporated therein potassium formate.

13. In the process of reproducing color designs by a duplicating process, the step of contacting a copy sheet with a design on a gelatinous duplicating mass having incorporated therein ammonium propionate.

14. A hectograph composition adapted for use on a hectograph band comprising gelatin and an aqueous solution including a water soluble salt of a fatty acid selected from the group consisting of alkali metal and ammonium salts, the ratio of aqueous solution to gelatin being within approximately five to twenty times the weight of the gelatin.

15. A hectograph composition adapted for use on a hectograph band comprising gelatin and an aqueous solution including sodium acetate, the ratio of aqueous solution to gelatin being within approximately five to twenty times-the weight of the gelatin. I

16. A hectograph composition adapted for use on a hectograph band comprising gelatin and an aqueous solution including potassium formate, the ratio of aqueoussolution to gelatin being within approximately five to twenty times the weight of the gelatin.

17. A hectograph composition adapted for use on a hectograph band comprising gelatin and an aqueous solution including ammonium propionate, the ratio of aqueous solution to gelatin being within approximately five to twenty times the weight of the gelatin.

18. A hectograph composition composed of a strong, flexible, dye absorbent gel in the form of a band adapted to be secured to a backing for use in hectograph machines, said composition including a salt of an organic acid adapted to increase the color intensity of characters produced on copies obtained from said composition by a hectograph process.

19. A hectograph composition composed of a strong, flexible, dye absorbent gel in the form of a band adapted to be secured to a backing for use inh ectograph machines, said composition in- 75 strong, flexible, dye absorbent gel in the form of a band adapted to be secured to a backing for use in hectograph machines, said composition includingsodium acetate.

WILLIAM nosxms. an. 

